Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4MB callsign genealogy
Currently held by SULOUFF, JOHN E
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by KM4MB's current licensee, walking backwards.
- Buckaloo, Michael DSCgranted 2024-12-24cancelled 2026-01-16
Successor callsigns
Callsigns held now by people who previously held KM4MB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KM4MB, oldest first.
- SULOUFF, JOHN E FL2007-11-21 → cancelled 2020-01-14
- Buckaloo, Michael D SC2026-01-16 active